Ecohydrology of a seasonal cloud forest in Dhofar: 2. Role of clouds, soil type, and rooting depth in tree‐grass competition
Ecohydrology of a seasonal cloud forest in Dhofar: 2. Role of clouds, soil type, and rooting depth in tree‐grass competition
复制标题
佐法尔季节性云雾森林的生态水文学：2.云、土壤类型和根深在树草竞争中的作用
DOI：
10.1029/2006wr005262
复制
发表时间：
2007
影响因子：
5.4
通讯作者：
E. Eltahir
中科院分区：
文献类型：
--
作者：
A. Hildebrandt;E. Eltahir
使用动态生态系统模型，我们调查夏季云浸没在阿曼的季节性落叶林的生态水文学的作用。这是一个半干旱地区，在长达3个月的季风季节中，植被沉浸在浓密的云层中。模拟的平衡植被在很大程度上取决于雨季的云量，在多云条件下预测树木，在假设无云季风时预测草地。通过改变土壤类型和生根深度，我们确定了一个生根深度在树的性能是最佳的。这是蒸腾作用最大，土壤中所有其他通量之和最小的深度。我们的分析表明，云层覆盖在这个生态系统中创造了有利的季节性，这对维护树木至关重要。这是通过（1）将生长季节从3个月延长到6个月和（2）允许更深的渗透来实现的，这确保了树木在过于干燥的环境中的竞争力。
Using a dynamic ecosystem model, we investigate the role of summer cloud immersion in the ecohydrology of a seasonal deciduous forest in Oman. This is a semiarid region where vegetation is immersed in dense cloud during a 3‐month‐long monsoon season. The simulated vegetation at equilibrium depends strongly on cloud cover during the wet season, with trees predicted under cloudy conditions and grasses when assuming a cloud‐free monsoon. By varying soil type and rooting depth, we identify a rooting depth at which tree performance is optimal. This is the depth at which transpiration is maximized and the sum of all other fluxes from the soil is minimized. Our analysis shows that cloud cover creates a favorable seasonality in this ecosystem that is crucial for maintaining trees. This is achieved by (1) prolonging the growing season from 3 months to 6 months and (2) allowing deeper infiltration, which assures competitiveness of trees in an otherwise too dry environment.